Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32l4+/STM32L4P5/TIM15/TIM15_CNT#0x0
TIM15 counter
Counter value
UIF Copy This bit is a read-only copy of the UIF bit in the TIMx_ISR register.
https://github.com/modm-io/cmsis-svd-stm32